Process for molding glass.



PATENTED NOV. 6, 1906K,

H. M. BROOKFIELD. PROCESS FOR MOLDING GLASS.

APPLICATION FILED NOV. 15. 1901.

INVENTOB Hamm/bf BY KW UNITED sTATEs PATENT orrIoE.

, HENRY h/LBROGKFIELD, NEI/V YRK, NQ Y.

#access Fon momma erase.

Specification of Letters Patent.

JApplicationlodNovember 15,1'9'01. Serial Nd. 82,367. l

To au whom it may concern:

Be it known that I, HENRY M. BROOK- FrELD, a citizen of the United States, and .a

resident of the city,county, and State of Newi York,'have invented certain new and useful Improvements in Processes for Molding Glass, of which the following is a specifica tion.

supplied to the molding parts and .in which the glass and molding parts are kept in contact with each other until the insulator or other glass article sets the said molding partsare apt to become too hot. As a result the molten glass is apt to stick to such m'olding parts-as, for example, in a press for making-screw insulators the glass is yapt .to stick to the screw or mold. In suchcasethe glass insulators or other articles will either be broken or imperfect and will be unfit for use.'` To overcome this, it has been attempted to employ cooling fmedia ofl differentkinds-v such as, for example, cold water or cold` air or hot water or heated air introduced into the interior of the molding parts. In no1 case, however, prior vt my invention, as far as I know or am informed, has such an `attempt been successful. -Either the molding parts are cooled too much-as, for example, when cold wat eris employed-or they are not cooled sufficiently. Where the molding 'parts are cooled too much orftoo rapidly, the results are as disastrous, if not- 'more.so, than where,

the molding' parts remain too highly heated. In the actual manufacture of glass insulators as practiced at and prior to the time of my invention the screw plungers used in presses for making 'glass insulators are maintained at a proper temperature only by making the screws detachable from the plunger and using a relatively large number of such screws and by varying the number used to suit the varying conditions at the time of manufacture. This gives the screws time to cool sufficient-ly before they are employed in the next molding operation, and by varying the nunk ber this cooling is varied to suit different conditions-as, .for example, varying tempera` My invention relates to processes for coolmg apparatus used in molding glass -articles v With which the molten glass comesinto conf n lfatentedNov. 6,y 1,906.1 ,i

ltures ofthe glass. Never prior to myinv`en` tion, so far as I am aware, has it been possi-- v ble to successfully employthe -samevscrews- 1 andthe same number of screws continuously making glass insulators. -v

I have discovered that bythe use of steam continuously introduced into the interior of the molding parts-such, for instance, as the plunger and `screw or the mold' of; a press' forVv making-glass msulat'orsefan 'even and suit-` able temperature 1s secured and maintained in' the molding' parts.` The-said parts are cooled sufficientlytopreventfthe sticking of' the glass while prevented fromgrowing-too cold, and thereby cracking the glass or other molding arts.

glass article. i Glass insulators made in a ypress wherevmy said inventionisemployed are not broken, and they do not stick to-the175 l L been suggested inconnection with ladles for f dipping and pouring molten glass and for. the

hollow interiors of cylinders forrolling heavy plates of glass; but in neither of these cases are the articles produced orthe conditions,

problems, or uses at all analogous to those .obtaining in connection. with the manufaf ture of glass insulatorsor similar glass-articles, and in neither of .them is there employed, f(

afcontinuous circulation of steam.

In the drawings accompanying thislspecisi,v

kfication and forming apart hereof `I have shown one form of apparatus by means of which myimproved process can beapplied in the making of glass insulators.

Referring to the. said drawings, I l

-represents the plunger and itsscrew and a mold of a press for making glass. insulators andcertain oftheconnecting parts, Isomeof thevparts being shownA in section.. `Fig. 2 is a horizontal cross-'section through the mold, L, '.n y

Referringjtothe specific apparatus-shown in the drawings, 'l represents the plunger, and 2 the screw mounted on its lower end, and' represents a mold for molding glass insulators. Plunger l is suitably mounted on the framework 4 of the press. A rotary motion is imparted to it through a pulley 5, clutch 6, and gears 7 and 8, lever 9 being for the purpose of throwing the parts of the clutch together or of separating them.'

1()` is an ordinary lever for lowering and raising plunger 1.

The particular arrangement of clutch here shown forms no part of the present inven- IIC eo and successively in 'an automatic press for#` tion and is not cleimed herein, but is not.`

abandoned, as it is the intention to moire it l ,the s ub'ect-instter of another epplicstion.

is e sleeve screw-threaded on its ente-` rior end screwing into screw-threeds on the interior of the lower part of plunger L tit its lower end sleeve l5 is ce sha ed as at 16, the cap completely fillmg t, e hollow space inside of screw 2 around ipe 14 end forming a bulkhead to prevent t e escapi g of the steam upward into theupper port o screw 2 except through the openings 17 through sleeveJ 15. These o enings l? open into the hollow -s ece insi e of plunger 1 above sleeve 15. hese ov enings 17 permit the steam to escape into t e interior of the plunger, to pese therefrom into chamber 18, near the upper part of the plunger`,and thence to escape as Weste steam through pi e 19.

The particular construction'of t e sleeve 15 and its buIlrhea-dforms no part of the present invention and is not claimed herein; but it is not abandoned, as it is the intention to mslre it the subject-matter of another application.

Steam is a plied to eachhalf of the mold 3 by means ofpa pipe 20, connecting with the hollow space 21 inside of the mold, the Waste steam escapinv through pipe 22.

When itis desired to stort up the ress to make glass insulators or other ortie es, the steam is first turned on and the molding parts ere heated before the molding of the glass insulators or other articles is begun. In this Way the press can be started at once to Ineke merchentable articles'. The first insulators or other articles made upon the ress are not broken, as has elways hereto ore been the case, but are made perfectslii;7 and in e merchenteblecondition. A consi rable saving isthereby e'ected.

My improved process is of particular value in connection with the screw and the mold of a press for making gless insulators, although As shown, the

senses it is not ted in its scope to such use,but me be a to eny mol' |11 devices :tor molding or lowing erticlee which come directly into contact with the molten gloss and sre of such la neture that the molding perte must be kept heated et e xed tempereture, but lessthen that of the molten. glass.

What l clsim as new, and desire to secureby Letters Potent, is- L lThe method of molding glass insulators 'or similer glass articles from molten gloss rwhich consists in batches of molten glass successively end. continuously, one lifter enother, into direct contact with the seme molding perte, molding the said insulators in such parts, removing the molded insuletor thereirom sitter eech moldin operetien, end

applying a continuouscire etion of stoom' to the interior of the molding parts during the molding operation to maint-ein. such ports at the proper tempereture.

2. The method of molding glass insulators or similar gloss articles' from molten less which consists in bringing batches of molten glass successively and continuousl one after another, into direct contact With t e molding parts of a ress for making glass insulators, includingt e screw of the plunger of such press, molding the insulators in such molding p erts, removing the molded insulator thereom eftereech molding operation, and ep" plying a continuous circulation of steam to the interior of the screw plunger during the molding operation to maintain seid screrr.r et the pro er temperature.

3. T e method of molding glass insulators or similer gloss articles from molten gloss which consists in bringing batches of .molten glass successively and continuously, one after another, into direct contect with the mold of a prees for making gless insulators, molding the insuletors in such mold, 'removing the molded insuletor therefrom after each moldin operetion, and ap lying e continuous circu stron of'steam to t e interior of the mo d during the molding operation to maintain the mold et the proper temperature.

ln testimony whereof l have signed my ICO 

